[Tom Line]

We used the previous iteration of vex mecanum and had breakage problems - these were directly addressed by Vex design changes last year. The failure mode was always the same - they fractured at the junction between the tab that supports the roller and the hub of the wheel. It made us a little gun shy so we went with the AM HD mecanum and had stellar results.

I stick by the idea that a single failure is too many - everyone in FRC knows what one loss can do to you in a competition. As a result we'll stick with the AM HD until Vex has a longer track record without failures.